Methanol electro-oxidation on gas diffusion electrodes prepared with Pt-Ru/C catalysts

被引:109
作者
Lizcano-Valbuena, WH [1 ]
Paganin, VA [1 ]
Gonzalez, ER [1 ]
机构
[1] Univ Sao Paulo, Inst Quim Sao Carlos, Dept Quim Fis, BR-13560970 Sao Carlos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
methanol oxidation; Pt-Ru/C catalysts; fuel cells; electrocatalysis; DMFC;
D O I
10.1016/S0013-4686(02)00341-9
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
This work presents results of the study of methanol electro-oxidation on gas diffusion electrodes with Pt-Ru catalysts supported on carbon. The catalysts were prepared by reduction with formic acid and their performance compared with Pt/C and Pt50Ru50/C E-TEK commercial catalysts, in half cell and single DMFC experiments. The results show that: (i) the activity of the catalysts in a half-cell depends on the concentration of methanol, the maximum being observed close to 2 mol l(-1); (ii) atomic contents of Ru of 25% and above increase the tolerance of the catalyst to larger methanol concentrations; (iii) the catalyst Pt75Ru25/C is the one that exhibits the larger activity for methanol oxidation. Gas diffusion electrodes built with this catalyst showed potentials 0.14 V higher than with Pt/C E-TEK when tested in single DMFC. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:3715 / 3722
页数:8
相关论文
共 46 条
[31]   Effect of particle size on the electrocatalysis by carbon-supported Pt electrocatalysts: an in situ XAS investigation [J].
Mukerjee, S ;
McBreen, J .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1998, 448 (02) :163-171
[32]   Structure of Pt/Ru catalysts using X-ray absorption near edge structure studies [J].
O'Grady, WE ;
Hagans, PL ;
Pandya, KI ;
Maricle, DL .
LANGMUIR, 2001, 17 (10) :3047-3050
[33]  
OLIVEIRANETO A, 2000, J BRAZIL CHEM SOC, V11, P39
[34]  
Paganin VA, 1996, J APPL ELECTROCHEM, V26, P297, DOI 10.1007/BF00242099
[35]  
PINHEIRO ALN, 2000, 2000 FUEL CELL SEM P, P63
[36]   STRUCTURE AND CHEMICAL-COMPOSITION OF A SUPPORTED PT-RU ELECTROCATALYST FOR METHANOL OXIDATION [J].
RADMILOVIC, V ;
GASTEIGER, HA ;
ROSS, PN .
JOURNAL OF CATALYSIS, 1995, 154 (01) :98-106
[37]   High performance direct methanol polymer electrolyte fuel cells [J].
Ren, XM ;
Wilson, MS ;
Gottesfeld, S .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (01) :L12-L15
[38]   PtRu alloy colloids as precursors for fuel cell catalysts - A combined XPS, AFM, HRTEM, and RDE study [J].
Schmidt, TJ ;
Noeske, M ;
Gasteiger, HA ;
Behm, RJ ;
Britz, P ;
Bonnemann, H .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1998, 145 (03) :925-931
[39]   DEVELOPMENT OF ALLOY ELECTROCATALYSTS FOR PHOSPHORIC-ACID FUEL-CELLS (PAFC) [J].
STONEHART, P .
JOURNAL OF APPLIED ELECTROCHEMISTRY, 1992, 22 (11) :995-1001
[40]   Effect of structure of carbon-supported PtRu electrocatalysts on the electrochemical oxidation of methanol [J].
Takasu, Y ;
Fujiwara, T ;
Murakami, Y ;
Sasaki, K ;
Oguri, M ;
Asaki, T ;
Sugimoto, W .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2000, 147 (12) :4421-4427